This problem is the "pincussion" setup on the convergence board. It, however can be caused by a failing power supply. If the set takes more than 60 seconds to produce the picture and up to 10 minutes to fully produce a good picture, even with the problem, power supply. Most likely if it does not do the mentioned it is the pin amp on the convergence board.

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If you can solder yes you can fix it your self Ck 3 capacitors cp110 cp114 cp150 --- If cp 150 is puffed up on top it is bad 2200uf 16v other 2 are 220uf 35v replace all3. also resolder all pinns on FBT flyback transfomer and make sure both ribbon connectors are in good.

Your convergence amplifiers are begining to malfunction. This is not expensive However I would advise that you get a qualified TV technician to work on the set due to a chance of damaging you TV if you install the amplifiers incorrectly.

Sorry Ginko, but a convergence problem would have the curves down from the top and up from the bottom. The hourglass shape is a pincushion problem. This can be as simple as a bad capacitor in the pincushion circuit.

Could you please confirm the model number so I can look up the probable part?

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